US20050131617A1 - Data collecting system and data transmitting method - Google Patents

Data collecting system and data transmitting method Download PDF

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Publication number
US20050131617A1
US20050131617A1 US10/985,967 US98596704A US2005131617A1 US 20050131617 A1 US20050131617 A1 US 20050131617A1 US 98596704 A US98596704 A US 98596704A US 2005131617 A1 US2005131617 A1 US 2005131617A1
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United States
Prior art keywords
data
data processing
period
processing devices
communication period
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Abandoned
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US10/985,967
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English (en)
Inventor
Hideaki Nii
Ichiro Kawabuchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Corp
TechExperts Inc
TECHEXPERTS INCORPORATON
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Pioneer Corp
TECHEXPERTS INCORPORATON
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Application filed by Pioneer Corp, TECHEXPERTS INCORPORATON filed Critical Pioneer Corp
Assigned to PIONEER CORPORATION, TECHEXPERTS INCORPORATION reassignment PIONEER CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KAWABUCHI, ICHIRO, NII, HIDEAKI
Publication of US20050131617A1 publication Critical patent/US20050131617A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C15/00—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path
    • G08C15/06—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path successively, i.e. using time division

Definitions

  • the present invention relates to a data collecting system for collecting data which are outputted from plural data processing devices.
  • a data collecting system is configured by connecting plural data outputting devices for outputting the data detected from the sensors and the data analyzing device to a common bus.
  • the data analyzing device serves as a host, and individually obtains the data from each data outputting device by designating each data outputting device on the basis of addresses and the like. Therefore, the plural data outputting devices transmit the data by an interrupting process under control of the data analyzing device so that the data analyzing device obtains the data from the plural data outputting devices in real time.
  • the respective data outputting devices extract the data detected from the sensors and transmit the detected data by the interrupting process.
  • the data outputting device since the data outputting device has to A/D-convert an analog detecting signal, which is outputted from the sensor, and transmit it, process loads required to the respective data outputting devices become large.
  • one data outputting device A/D-converts analog detected data from the sensor during the transmission of the data from another data outputting device to the data analyzing device, it can happen that accuracy of A/D conversion is problematically reduced by a noise caused by the transmission of the data by another data outputting device.
  • the present invention has been achieved in order to solve the above problems. It is an object of this invention to provide a data collecting system, whose configuration is simple, capable of effectively collecting plural data without an effect of a noise due to communication.
  • a data collecting system which includes a data collecting device and plural data processing devices connected to the data collecting device by a cascade connection, each of the data processing devices sharing repeated data processing period and communication period with each other, individually executing a data process in the data processing period, and adding data obtained by the data process in the communication period to a data transmitting signal received from the preceding data processing device, to transmit it to the subsequent data processing device.
  • Each of the data processing devices individually executes an A/D conversion and other data process, for example, and adds the data obtained by the data process to the data transmitting signal to transmit it to the subsequent cascade-connection data processing device in sequence. More concretely, the data processing device at the head of the cascade connection periodically transmits starting information of the data transmitting period and starting information of a data processing period in order to prescribe the data processing period and the communication period of the whole data collecting system.
  • the data transmitting signal includes the data processing period and the communication period.
  • the data processing period all the data processing devices execute the data process, and never transmit the data to the subsequent data processing devices. Thereby, it can be prevented that a noise caused by the transmission of the data puts an adverse effect on the data process in all the data processing devices.
  • the respective data processing devices transmit the data obtained by the data process in sequence. Therefore, the respective data processing devices can execute the data process without the effect of the noise, and can efficiently transmit a result thereof to the data collecting device.
  • the data processing period in the data transmitting signal is set to be longer than a maximum data processing time by the plural data processing devices, all the data processing devices can start transmitting the data in the communication period after individually completing the data process.
  • the communication period in the data transmitting signal may include an individual communication period assigned to each of the plural data processing devices. Since each of the data processing devices transmits the data in the individual communication period assigned to its data processing device, the data collecting device can correctly discriminate the data which are transmitted from the plural data processing devices. By continuously assigning the individual communication period within the communication period, the communication period can be used efficiently.
  • each of the data processing devices may include an A/D converter which executes A/D conversion as the data process. More concretely, each of the data processing devices may be connected to an analog sensor, and may A/D-convert an analog detecting signal which is outputted from the analog sensor as the data process. Since the data is not transmitted during the A/D converting process in each of the data processing devices, it can be prevent that accuracy of A/D conversion is decreased due to a noise caused by the data transmission.
  • the data processing device at the head of the cascade connection periodically transmits the data transmitting signal with a cycle longer than a total of the data processing period and the communication period.
  • the data collecting system can periodically obtain accurate data from each of the data processing devices.
  • a data transmitting method which is executed among plural cascade-connection data processing devices, the data processing device at a head of the cascade connection generating a data transmitting signal including a data processing period and a communication period, and transmitting it to the subsequent data processing device, and each of the data processing devices executing a data process in the data processing period, and transmitting data obtained by the data process to the subsequent data processing device in the communication period based on the data transmitting signal.
  • FIG. 1 is a block diagram schematically showing a configuration of a robot arm controlling system to which a data collecting system according to an embodiment of the present invention is applied.
  • FIGS. 2A and 2B are block diagrams showing an inside configuration of a data processing device shown in FIG. 1 .
  • FIGS. 3A to 3 E are timing charts showing data transmitting signals among data processing devices.
  • FIG. 1 schematically shows a configuration of a robot arm controlling system to which a data collecting system according to an embodiment of the present invention is applied.
  • a robot arm controlling system 100 controls positions of plural robot arms, and controls three robot arms 24 a to 24 c in the present embodiment.
  • the robot arm controlling system 100 includes data processing devices 10 a to 10 c , sensors 22 a to 22 c , the robot arms 24 a to 24 c , actuators 26 a to 26 c , a data collecting/analyzing device 2 and a controller 3 .
  • the positions of the respective robot arms 24 a to 24 c are controlled by the actuators 26 a to 26 c which use air pressure, for example.
  • the respective actuators 26 a to 26 c are controlled by the controller 3 .
  • the positions of the robot arms 24 a to 24 c are detected by the sensors 22 a to 22 c , respectively.
  • the respective sensors 22 a to 22 c are configured as analog sensors for detecting the positions of the robot arms 24 a to 24 c , and output analog detecting signals indicating the detected positions of the robot arms 24 a to 24 c to the respective data processing devices 10 a to 10 c.
  • the data processing devices 10 a to 10 c A/D-convert the analog detecting signals indicating the positions of the robot arms 24 a to 24 c which are supplied from the sensors 22 a to 22 c , and output them as digital detecting signals.
  • the data processing devices 10 a to 10 c are connected to the data collecting/analyzing device 2 by a serial connection system which is generally called “cascade connection” or “daisy chain”. Namely, the data processing device 10 a which is located at the head of the cascade connection supplies a data transmitting signal Sa to the subsequent data processing device 10 b , and the data processing device 10 b supplies a data transmitting signal Sb to the further subsequent data processing device 10 c .
  • the data processing device 10 c supplies a data transmitting signal Sc to the data collecting/analyzing device 2 .
  • the data processing devices 10 a to 10 c add digital detecting signals Da to Dc corresponding to the sensors 22 a to 22 c to the data transmitting signals Sa to Sc respectively, and transmit them to the subsequent data processing apparatus 10 or the data collecting/analyzing device 2 , though the detail will be explained later.
  • the digital detecting signals Da to Dc corresponding to the sensors 22 a to 22 c are collected and analyzed by the data collecting/analyzing device 2 .
  • the data collecting/analyzing device 2 analyzes the positions of the respective sensors 22 a to 22 c on the basis of the collected digital detecting signals Da to Dc, and outputs, to the controller 3 , position controlling quantities of the respective robot arms 24 a to 24 c in accordance with the result.
  • the controller 3 drives the respective actuators 26 a to 26 c on the basis of the position controlling quantities of the respective sensors 22 a to 22 c which are obtained from the data collecting/analyzing apparatus 2 , and controls the positions of the respective robot arms 24 a to 24 c .
  • the positions of the robot arms 24 a to 24 c are feedback-controlled in such the method.
  • Such the position control by detecting the digital detecting signals Da to Dc and collecting the data to analyze it, is repeatedly and periodically executed.
  • FIG. 2A shows the inside configuration of the data processing apparatus 10 a located at the head of the cascade connection
  • FIG. 2B shows the inside configuration of the data processing devices 10 b and 10 c located at positions subsequent to the data processing apparatus 10 a.
  • the data processing device 10 a includes an A/D converter 16 , a communication unit 14 and a CPU 12 for control.
  • the A/D converter 16 A/D-converts the analog detecting signal which is supplied from the sensor 22 a , and generates the digital detecting signal Da.
  • the CPU 12 generates data transmitting signals for transmitting the digital detecting signals Da to Dc through the cascade-connection data processing devices 10 a to 10 c , and adds the digital detecting signal Da to the data transmitting signal as the need arises.
  • the communication unit 14 transmits the data transmitting signal to the subsequent data processing device 10 b under the control of the CPU 12 .
  • each of the subsequent data processing devices 10 b and 10 c includes the CPU 12 , the communication unit 14 , a communication unit 15 and the A/D converter 16 .
  • each of the data processing devices 10 b and 10 c includes the communication unit 15 for performing communication with the data processing device 10 a or 10 b located at the upstream position of the cascade connection in addition to the configuration of the data processing device 10 a.
  • the A/D converter 16 A/D-converts the analog detecting signal which is supplied from the correspondent sensor 22 b or 22 c , and generates the digital detecting signal Db or Dc.
  • the communication unit 15 receives the data transmitting signal Sa or Sb from the preceding data processing device 10 a or 10 b .
  • the CPU 12 adds, to the data transmitting signal Sa or Sb, the digital detecting signal Db or Dc generated by the A/D converter 16 , and supplies it to the communication unit 14 .
  • the communication unit 14 outputs the data transmitting signal Sb or Sc. It is noted that the data processing device 10 b supplies the data transmitting signal Sb to the subsequent data processing device 10 c , and the data processing device 10 c supplies the data transmitting signal Sc to the data collecting/analyzing device 2 .
  • FIGS. 3A to 3 E are timing charts showing the data transmitting signals which are communicated among the data processing devices 10 a to 10 c .
  • the data transmitting signals outputted from the data processing devices 10 a , 10 b and 10 c are indicated as Sa, Sb and Sc, respectively, identically to those shown in FIG. 1 .
  • the data processing device 10 a located at the head of the cascade connection generates the data transmitting signal.
  • the present invention is characterized in that the data transmitting signal includes a data processing period Tp and a communication period Tdt, as shown in FIGS. 3A to 3 E.
  • the data processing period Tp the respective data processing devices 10 a to 10 c execute the data process, and do not communicate (transmit) the data.
  • the data processing period Tp is set as a period in which the respective data processing devices execute only the data process.
  • the data process is an A/D converting process of the analog detecting signal by the A/D converter 16 .
  • the data processing devices 10 a to 10 c share the data processing period Tp and the communication period Tdt, and the data processing period Tp and the communication period Tdt are periodically and repeatedly executed.
  • FIG. 3A shows a waveform of data transmitting signal outputted from the respective data processing devices 10 a to 10 c in the data processing period Tp. Since outputting the data from the respective data processing devices 10 a to 10 c is inhibited in the data processing period Tp, output data is not included at the position corresponding to the communication period Tdt.
  • the data processing period Td dedicated to only the data processing, in which the respective data processing devices 10 a to 10 c do not transmit the data and only individually execute the data process, in the data transmitting signals S it can be prevented that a noise which may occur due to the data communication affects the data process in the respective data processing devices.
  • a noise which may occur due to the data communication affects the data process in the respective data processing devices.
  • the A/D conversion in the present embodiment if a certain data processing device executes the data communication during the A/D converting process of anther data processing device, the effect of the noise caused by the data communication is given to the A/D converting process, and accuracy of the A/D conversion sometimes decreases.
  • a detected quantity may change by the effect of the noise due to the communication, and an adverse effect is given to the control of the whole system.
  • the data processing period Tp is provided and all the data processing devices never execute the communication in the period, the data process can be executed in the respective data processing devices with high accuracy.
  • the data processing period Tp is set to be longer than the longest necessary time of the data processes executed in the plural data processing devices 10 a to 10 c . Thereby, it can be prevented that the data communication is started before all the data processing devices individually complete the data process.
  • the communication period Tdt is set as a period in which the respective data processing devices 10 a to 10 c transmit the data in sequence.
  • the communication period Tdt includes individual communication periods Ta to Tc, which are assigned to the respective data processing devices 10 a to 10 c , and a margin period Tm.
  • the communication period Tdt is dedicated to the data transmission, if the respective data processing devices 10 a to 10 c transmit the data in disorder, the data collecting/analyzing device 2 cannot identify from which data processing device the received data is transmitted. Therefore, the individual communication periods Ta to Tc are set in the communication period Tdt. Namely, it is prescribed that the data processing devices 10 a to 10 c transmit the data during the individual communication periods Ta to Tc, respectively. Thereby, the data collecting/analyzing device 2 can regard the data transmitted ⁇ @in each individual communication period as the data which is transmitted from the data processing device 10 corresponding to the individual communication period.
  • FIGS. 3B to 3 D schematically show data contents of the data transmitting signals Sa to Sc which are outputted from the respective data processing devices 10 a to 10 c in the communication period Tdt.
  • the data transmitting signal Sa outputted from the data processing device 10 a includes the digital detecting signal Da, and the digital detecting signal Db is added to the data transmitting signal Sb outputted from the data processing device 10 b .
  • the digital detecting signal Dc is further added to the data transmitting signal Sc outputted from the data processing device 10 c .
  • FIG. 3E shows an example of a waveform of the data transmitting signal Sc shown in FIG. 3D .
  • the lengths (time widths) of the respective individual communication periods Ta to Tc are determined in accordance with the quantities of the data which are outputted from the respective data processing devices. Namely, a long individual communication period is given to the data processing device having a large output data quantity, and a short individual communication period is given to the data processing device having a small output data quantity.
  • the length (time width) of the individual communication period is prescribed by the quantity of the data to be transmitted.
  • the time width (transmission data quantity) of the correspondent individual communication period device may be determined on the basis of the output data quantity from each data processing, and may be set in the communication period Tdt in sequence. For example, if it is assumed that the output data quantities from the data processing devices 10 a and 10 b are 12 bits respectively and the output data quantity from the data processing device 10 c is 16 bits, a period from starting time t1 of the communication period Tdt to a period corresponding to the data quantity 12 bits, i.e., time t2, may be set to the individual communication period Ta, and a period from starting time t2 to a period corresponding to the data quantity 12 bits, i.e., time t3, may be set to the individual communication period Tb.
  • a period from time t3 to a period corresponding to the data quantity 16 bits, i.e., time t4, may be set to the individual communication period Tc.
  • each of the data processing devices 10 a to 10 c adds its output data (each of the digital detecting signals Da to Dc) within the correspondent individual communication period in the communication period Tdt of the data transmitting signal S in sequence, and transmits the data to the data processing device at the downstream position.
  • the output data from all the data processing devices is transmitted to the data collecting/analyzing device 2 through the cascade connection.
  • the margin period Tm is set for the purpose of a stable execution of a data transmitting process.
  • each individual communication period is set so that the next individual communication period Tb starts immediately after the end of the individual communication period Ta. Thereby, efficient communication becomes possible.
  • the data processing device 10 a located at the head of the cascade connection periodically generates the data transmitting signal with a cycle longer than the total of the data processing period Tp and the communication period Tdt, and transmits it. Namely, in order to prescribe the data processing period Tp and the communication period Tdt of the whole robot arm controlling system 100 , the data processing device 10 a periodically transmits the starting information of the data processing period Tp and also the starting information of the data communication period Tdt. Timing of transmitting the starting information is designed on the basis of an individual timer included in the data processing device 10 a.
  • the individual communication period in the communication period Tdt of the data transmitting signal, is arranged in sequence from the data processing device 10 a at the upstream position of the cascade connection to the data processing device 10 c at the downstream position.
  • the arrangement is not indispensable. Namely, in the communication period Tdt, if the plural individual communication period is set in an order not to be overlapped with each other on the time axis, the sequence is not necessarily from the data processing device at the upstream position of the cascade connection to the data processing device at the downstream position.
  • the application of the present invention is not limited to the robot arm control system. Namely, the present invention can be applied to various systems and circumstances for supplying the output data from the plural data processing devices and data outputting devices to the predetermined devices by the cascade connection.
  • the A/D converting process of the analog output signal from the sensor is illustrated as the example of the data process which is executed in each of the data processing devices.
  • the application of the present invention is not limited to that case, and the present invention can be applied to the data processing device which executes various data processes.
  • the present invention since the data processing period is set and transmission of the data is inhibited during the period, it is particularly effective to apply the present invention to a data processing device which executes a data process comparatively sensitive to a noise.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Small-Scale Networks (AREA)
US10/985,967 2003-11-13 2004-11-12 Data collecting system and data transmitting method Abandoned US20050131617A1 (en)

Applications Claiming Priority (2)

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JP2003384013A JP2005151043A (ja) 2003-11-13 2003-11-13 データ収集システム及びデータ転送方法
JP2003-384013 2003-11-13

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EP (1) EP1531440A3 (fr)
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CN (1) CN1617183A (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
RU2613532C1 (ru) * 2013-06-14 2017-03-16 ЭЙДЗО Корпорейшн Многомониторная система и используемые в ней компьютерная программа и отображающее устройство

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4343212B2 (ja) 2006-11-27 2009-10-14 ファナック株式会社 データ送受信方式
US8112676B2 (en) 2009-02-23 2012-02-07 International Business Machines Corporation Apparatus and method to generate and collect diagnostic data
JP2016128967A (ja) * 2015-01-09 2016-07-14 住友電気工業株式会社 電子機器
JP6375972B2 (ja) 2015-01-28 2018-08-22 オムロン株式会社 シンクノード、センサネットワークシステム、情報収集方法、及び情報収集プログラム
JP5939698B1 (ja) * 2015-07-08 2016-06-22 豊中計装株式会社 アナログデジタル信号混合伝送装置
JP6625949B2 (ja) * 2016-08-31 2019-12-25 ファナック株式会社 高速変換器、測定システム、及び高速変換プログラム

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US6424333B1 (en) * 1995-11-30 2002-07-23 Immersion Corporation Tactile feedback man-machine interface device
US20040189495A1 (en) * 2003-03-27 2004-09-30 Hung-Chih Wu Extension unit for PLC system and I/O controller thereof

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JPS5873260A (ja) * 1981-10-28 1983-05-02 Seikosha Co Ltd デ−タ伝送方式
DE4422387C2 (de) * 1994-06-27 2001-05-03 Micronas Gmbh Sensorbussystem mit identischen Nebenstufen

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
US6424333B1 (en) * 1995-11-30 2002-07-23 Immersion Corporation Tactile feedback man-machine interface device
US20040189495A1 (en) * 2003-03-27 2004-09-30 Hung-Chih Wu Extension unit for PLC system and I/O controller thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2613532C1 (ru) * 2013-06-14 2017-03-16 ЭЙДЗО Корпорейшн Многомониторная система и используемые в ней компьютерная программа и отображающее устройство
RU2613532C9 (ru) * 2013-06-14 2017-07-17 ЭЙДЗО Корпорейшн Многомониторная система и используемые в ней компьютерная программа и отображающее устройство

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CN1617183A (zh) 2005-05-18
JP2005151043A (ja) 2005-06-09
EP1531440A2 (fr) 2005-05-18
EP1531440A3 (fr) 2006-08-16

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